The 2 plants on the left probably won't live with that low light. Only other plants that will grow with that light are ferns.
I too have a 29G. After adding a few T8 bulbs and a PC light fixture changed to a T5NO light strip. I wasted money trying 3 T8 bulbs. Pet Blvd sells it cheap under brand name Coralife. Pet Smart sells it under Aqueon brand name.